BBN is this company http://www.bbn.com/. They are an American defense
research company that does a lot of work for DARPA.
A while back they had a contract (DARPA i think) to write 802.11b software
for GNURadio and the USRP I. That software is what we call "bbn 802.11."
However that contract has l
hello:
can anyone tell me the meaning of bbn when related to bbn 80211?
thanks!
xiaoming
_
张
On Fri, Aug 28, 2009 at 09:00:07AM -0700, Josh Blum wrote:
> The sample rate of the signal source is 1M. The sample rate of the usrp2
> is 100M/64. Your rates disagree.
>
> -Josh
>
> dennis wrote:
>> Hi @ all
>>
>> Sorry, this stuff is new for me and therfore sorry for a possible
>> stupid quest
On Fri, Aug 28, 2009 at 5:22 PM, Eric Blossom wrote:
> If you're trying to send a sine wave, this will work much better:
> (Generates a complex sinusoid == exp(jwt))
>
> sig_source_c -> head -> usrp.sink_c
>
> Or you could use a hilbert transform to generate the quadrature
> component. float_to_c
On Fri, Aug 28, 2009 at 02:05:02PM -0300, Igor Almeida wrote:
> On Fri, Aug 28, 2009 at 12:56 PM, Douglas
> Geiger wrote:
> > That sounds like it could be a frequency offset between TX and RX. You
> > say you aren't synchronized (which I interpret to mean you don't lock
> > the clocks of the TX and
As a side note, another strange thing I noticed is that the frequency
range returned is always different (smaller) than the one in the spec
sheet. Why is that?
An oversight. I'll fix it.
Matt
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On Fri, Aug 28, 2009 at 12:56 PM, Douglas
Geiger wrote:
> That sounds like it could be a frequency offset between TX and RX. You
> say you aren't synchronized (which I interpret to mean you don't lock
> the clocks of the TX and RX together somehow) - do you have a costas
> or similar carrier offset
The sample rate of the signal source is 1M. The sample rate of the usrp2
is 100M/64. Your rates disagree.
-Josh
dennis wrote:
Hi @ all
Sorry, this stuff is new for me and therfore sorry for a possible stupid
question ;-) . I play a little with GRC and want to transmit e.g. a
cosine-wave at
On Fri, Aug 28, 2009 at 11:09 AM, Igor Almeida wrote:
>
> I [believe I] am having a similar problem with USRP rev4 and RFX2400.
> Sending a QAM-modulated signal in a 2.5GHz carrier with no
> synchronization gives me a lot of background noise before the actual
> signal. So I am prepending a 2MHz sin
On Fri, Apr 24, 2009 at 12:30 AM, Yongsang Kim wrote:
> Hi, all.
>
> I did single-tone test using USRP2 with RFX2400 and XCVR2450.
> There are some undesired signals in the results.
>
> My single-tone test is as follows:
> - Wired connection between USRP2 and Spectrum analyzer
> - Single-tone is tr
Eric Blossom comsec.com> writes:
> top_block.lock()
> disconnect(...)
> ...
> connect(...)
> ...
> top_block.unlock()
Thank you Eric,
I found the lock/unlock function can work only in benchmark_ofdm_rx.py.
When I use them to change the graph or even not change any thing with
benchma
Hi @ all
Sorry, this stuff is new for me and therfore sorry for a possible stupid
question ;-) . I play a little with GRC and want to transmit e.g. a
cosine-wave at a specific frequency e.g. at 900MHz and width, say 2MHz.
But my problem are as following:
If i add only 2 blocks, i got nice co
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